Built in 1910, Fonthill Castle was the home of Henry Chapman Mercer and served as a showplace for his famed Moravian tiles. Designed by Mercer, this National Historic Landmark building is an eclectic mix of architectural styles and has evolved into a popular museum celebrating Mercer and his collections. One-hour guided tours only; reservations strongly advised. $8-$15; $15-$26 combo ticket with Mercer Museum. M-Sa 10 am-5 pm, Su noon-5 pm.